Re: [PATCH v3 7/7] xen/arm: Activate TID3 in HCR_EL2

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 9 Dec 2020, Bertrand Marquis wrote:
> Activate TID3 bit in HSR register when starting a guest.
> This will trap all coprecessor ID registers so that we can give to guest
> values corresponding to what they can actually use and mask some
> features to guests even though they would be supported by the underlying
> hardware (like SVE or MPAM).
> 
> Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
> Changes in V2: Rebase
> Changes in V3: Rebase
> 
> ---
>  xen/arch/arm/traps.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
> index 28d9d64558..c1a9ad6056 100644
> --- a/xen/arch/arm/traps.c
> +++ b/xen/arch/arm/traps.c
> @@ -98,7 +98,7 @@ register_t get_default_hcr_flags(void)
>  {
>      return  (HCR_PTW|HCR_BSU_INNER|HCR_AMO|HCR_IMO|HCR_FMO|HCR_VM|
>               (vwfi != NATIVE ? (HCR_TWI|HCR_TWE) : 0) |
> -             HCR_TSC|HCR_TAC|HCR_SWIO|HCR_TIDCP|HCR_FB|HCR_TSW);
> +             HCR_TID3|HCR_TSC|HCR_TAC|HCR_SWIO|HCR_TIDCP|HCR_FB|HCR_TSW);
>  }
>  
>  static enum {
> -- 
> 2.17.1
>